Design and implement a simple console application in C$++$ that models an online store inventory system, based on the requirements and class relationships described below:

Class Descriptions:

Item: Represents a generic item sold in the online store. Each item is characterized by a unique identifier $($ID$),$ a name, and a price. The Item class should provide methods to get and set these properties. Additionally, it should include a method to print item details.

Vendor: Represents a vendor supplying items to the store. A vendor is described by a vendor ID$,$ a name, and an address. This class should provide methods to get and set these properties. The toString$()$ method should return a string representation of the vendor, including all its details.

Storeltem: Extends the Item class. In addition to the properties inherited from Item, Storeltem includes a property to store the vendor $($supplier$)$ of the item. The class should override the method to print item details to include vendor information if available. It should also include a method getVendorName$()$ that returns the name of the vendor if set, or "Unknown" if not.

Implementation Details:

The Storeltem class should be initialized with an ID$,$ name, and price. Vendor details should be set using a separate method, setVendor$(),$ which takes a Vendor object as a parameter.

The toString$()$ method in both Vendor and Storeltem should return a string representation of the object's state in a readable format. For Storeltem, implement two versions of toString$()$: one that only returns item details and another that also includes vendor details based on a boolean parameter.

Application Flow:

Your console application should prompt the user to enter details for a list of items and their corresponding vendors.

After entering the details, the application should display the information of each Storeltem using the toString$()$ method, first without vendor details and then with vendor details.

It should also demonstrate the use of getVendorName$()$ for each Storeltem.

Assignment Objectives:

Demonstrate understanding of class inheritance and polymorphism in C$++.$

Implement class methods, including constructors, accessors, mutators, and methods for string representation of objects.

Handle user input in a console application and display output based on the user input.